Promax Hornet brake pads

I just picked up the Trek GF Cobia and absolutley love it. Of course i've done the usual upgrades (Bontrager bar, platforms) and about to try the Thudbuster. It arrives on April 8th. Now to my question. What brake pads, if any, are compatable with the Promax Hornets? I am replacing my rotors with Formula 1's. The stock pads are louder than the cheaper brake system on my 26'r. Thanks for any suggestions.